Comprehensive upgrade of the high-resolution small-angle neutron scattering instrument KWS-3 at FRM II

After the KWS-3 instrument was moved from Jülich to Munich (in the first half of 2007), it underwent a fundamental evaluation, with the final result that a major upgrade for the whole instrument became necessary. The main subject of the upgrade project was a general mirror refurbishment,i.e.a new polishing and subsequently a new coating of the mirror surface with the isotope65Cu. In parallel to the mirror refurbishment, comprehensive upgrade activities in the vacuum system, electronics and programming have been performed with the aims of protecting the new mirror coating from aging (degradation of the mirror's surface properties), transforming the instrument into a user-friendly state and introducing conceptual improvements.

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Final technical report. Development and installation of a high resolution position sensitive 40x40 cm{sup 2} gas detector for small angle neutron scattering applications at IPNS: ORDELA model 2410N position-sensitive proportional counter system

10.2172/807502 ◽

2001 ◽

Author(s):

Daniel M. Kopp

Keyword(s):

High Resolution ◽

Neutron Scattering ◽

Small Angle ◽

Proportional Counter ◽

Small Angle Neutron Scattering ◽

Technical Report ◽

Gas Detector ◽

Position Sensitive

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Neutron Larmor diffraction on powder samples

Journal of Applied Crystallography ◽

10.1107/s160057671901611x ◽

2020 ◽

Vol 53 (1) ◽

pp. 88-98 ◽

Cited By ~ 1

Author(s):

Thomas Keller ◽

Piotr Fabrykiewicz ◽

Radosław Przeniosło ◽

Izabela Sosnowska ◽

Bernhard Keimer

Keyword(s):

Experimental Data ◽

High Resolution ◽

Synchrotron Radiation ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Spin Echo ◽

Analysis Technique ◽

Momentum Resolution ◽

Powder Samples

A hitherto unrecognized resolution effect in neutron Larmor diffraction (LD) is reported, resulting from small-angle neutron scattering (SANS) in the sample. Small distortions of the neutron trajectories by SANS give rise to a blurring of the Bragg angles of the order of a few hundredths of a degree, leading to a degradation of the momentum resolution. This effect is negligible for single crystals but may be significant for polycrystalline or powder samples. A procedure is presented to correct the LD data for the parasitic SANS. The latter is accurately determined by the SESANS technique (spin–echo small-angle neutron scattering), which is readily available on Larmor diffractometers. The analysis technique is demonstrated on LD and SESANS data from α-Fe2O3 powder samples. The resulting d-spacing range agrees with experimental data from high-resolution synchrotron radiation powder diffraction on the same sample.

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Structural characterization of manganese-substituted nanocrystalline zinc oxide using small-angle neutron scattering and high-resolution transmission electron microscopy

Journal of Applied Crystallography ◽

10.1107/s002188980903475x ◽

2009 ◽

Vol 42 (6) ◽

pp. 1085-1091 ◽

Cited By ~ 7

Author(s):

B. Roy ◽

B. Karmakar ◽

J. Bahadur ◽

S. Mazumder ◽

D. Sen ◽

...

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Zinc Oxide ◽

High Resolution ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron

A series of zinc oxide (ZnO) nanoparticles, substituted with manganese di-oxide, have been synthesized through a modified ceramic route using urea as a fuel. X-ray diffraction and high-resolution transmission electron microscopy studies indicate that the sizes of the ZnO particles are of nanometer dimension. Particles remain as single phase when the doping concentration is below 15 mol%. Small-angle neutron scattering indicates fractal-like agglomerates of these nanoparticles in powder form. The size distributions of the particles have been estimated from scattering experiments as well as microscopy studies. The average particle size estimated from small-angle scattering experiments was found to be somewhat more than that obtained from X-ray diffraction or electron microscopy measurement.

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A Unified User-Friendly Instrument Control and Data Acquisition System for the ORNL SANS Instrument Suite

Applied Sciences ◽

10.3390/app11031216 ◽

2021 ◽

Vol 11 (3) ◽

pp. 1216

Author(s):

Xingxing Yao ◽

Blake Avery ◽

Miljko Bobrek ◽

Lisa Debeer-Schmitt ◽

Xiaosong Geng ◽

...

Keyword(s):

Data Acquisition ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Data Acquisition System ◽

Acquisition System ◽

Instrument Control ◽

User Friendly ◽

Sans Instrument ◽

New System

In an effort to upgrade and provide a unified and improved instrument control and data acquisition system for the Oak Ridge National Laboratory (ORNL) small-angle neutron scattering (SANS) instrument suite—biological small-angle neutron scattering instrument (Bio-SANS), the extended q-range small-angle neutron scattering diffractometer (EQ-SANS), the general-purpose small-angle neutron scattering diffractometer (GP-SANS)—beamline scientists and developers teamed up and worked closely together to design and develop a new system. We began with an in-depth analysis of user needs and requirements, covering all perspectives of control and data acquisition based on previous usage data and user feedback. Our design and implementation were guided by the principles from the latest user experience and design research and based on effective practices from our previous projects. In this article, we share details of our design process as well as prominent features of the new instrument control and data acquisition system. The new system provides a sophisticated Q-Range Planner to help scientists and users plan and execute instrument configurations easily and efficiently. The system also provides different user operation interfaces, such as wizard-type tool Panel Scan, a Scripting Tool based on Python Language, and Table Scan, all of which are tailored to different user needs. The new system further captures all the metadata to enable post-experiment data reduction and possibly automatic reduction and provides users with enhanced live displays and additional feedback at the run time. We hope our results will serve as a good example for developing a user-friendly instrument control and data acquisition system at large user facilities.

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Optimization of the thickness of a ZnS/6LiF scintillator for a high-resolution detector installed on a focusing small-angle neutron scattering spectrometer (SANS-U)

Journal of Applied Crystallography ◽

10.1107/s0021889812008928 ◽

2012 ◽

Vol 45 (3) ◽

pp. 507-512 ◽

Cited By ~ 5

Author(s):

Hiroki Iwase ◽

Masaki Katagiri ◽

Mitsuhiro Shibayama

Keyword(s):

High Resolution ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Detection Efficiency ◽

Pulse Height ◽

Atomic Energy ◽

Japan Atomic Energy Agency ◽

Energy Agency ◽

Position Sensitive

This study involves the upgrade of a high-resolution position-sensitive detector (HR-PSD) installed on the small-angle neutron scattering spectrometer (SANS-U) at the Japan Atomic Energy Agency. By using both neutron lenses and the HR-PSD, the accessible low-Qlimit can be extended to the order of 10−4 Å−1[Qis the magnitude of the scattering vector defined byQ= (4π/λ)sinθ, where λ and 2θ are the wavelength and the scattering angle, respectively]. The HR-PSD consists of a cross-wired position-sensitive photomultiplier tube (PSPMT) and a commercial ZnS/6LiF scintillator. To improve the experimental efficiency of focusing small-angle neutron scattering (FSANS) experiments, a high-performance ZnS/6LiF scintillator developed at the Japan Atomic Energy Agency has been utilized. For the PSPMT and data-acquisition system installed on SANS-U, the thickness of the ZnS/6LiF scintillator was optimized by measuring the thickness dependence of the pulse-height spectra. Under the experimental conditions of SANS-U, the optimum thickness of the ZnS/6LiF scintillator (ZnS:6LiF = 2:1) was determined to be 0.433 mm by measuring the total counts and peak positions of the pulse-height spectra. Installation of the optimized ZnS/6LiF scintillator improved detection efficiency by 1.39 times over that of a commercial scintillator at the same level of background counts andQresolution in FSANS experiments.

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Modernization of the small-angle neutron scattering spectrometer SANS-U by upgrade to a focusing SANS spectrometer

Journal of Applied Crystallography ◽

10.1107/s0021889811007527 ◽

2011 ◽

Vol 44 (3) ◽

pp. 558-568 ◽

Cited By ~ 24

Author(s):

Hiroki Iwase ◽

Hitoshi Endo ◽

Masaki Katagiri ◽

Mitsuhiro Shibayama

Keyword(s):

High Resolution ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Position Sensitive Detector ◽

Incident Neutron ◽

Sensitive Detector ◽

Energy Agency ◽

Position Sensitive ◽

Position Sensitive Photomultiplier Tube

The small-angle neutron scattering spectrometer SANS-U at the research reactor (JRR-3) of the Japan Atomic Energy Agency, Tokai, Japan, has been successfully upgraded. This major upgrade was undertaken in order to install a high-resolution position-sensitive detector consisting of a cross-wired position-sensitive photomultiplier tube combined with a ZnS/6LiF scintillator on the SANS-U spectrometer. Without changing the total length of the spectrometer, the aim was to extend the accessible low-Qlimit (Qis the magnitude of the scattering vector) and to shorten the measurement time by employing focusing small-angle neutron scattering (FSANS). By using both spherical MgF2biconcave lenses and the new high-resolution position-sensitive detector, the accessible low-Qlimit was extended from 2.5 × 10−3to 3.8 × 10−4 Å−1. As a result, SANS-U can continuously cover a wideQrange from 3.8 × 10−4to 0.35 Å−1with a wavelength of 7 Å. FSANS can be utilized not only to improve the accessible low-Qlimit but also to increase the intensity of incident neutrons passing through the sample in the conventionalQrange from 2.5 × 10−3to 0.35 Å−1. The use of `high-intensity' FSANS also allowed a reduction of the measuring time by approximately 1/3.16 by increasing the incident neutron intensity.

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KWS-1: Small-angle scattering diffractometer

Journal of large-scale research facilities JLSRF ◽

10.17815/jlsrf-1-26 ◽

2015 ◽

Vol 1 ◽

Cited By ~ 36

Author(s):

Henrich Frielinghaus ◽

Artem Feoktystov ◽

Ida Berts ◽

Gaetano Mangiapia

Keyword(s):

High Resolution ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Small Angle Scattering ◽

Angle Scattering

The KWS-1, which is operated by JCNS, Forschungszentrum Jülich, is a small-angle neutron scattering diffractometer dedicated to high resolution measurements.

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